Nav Fixture produces NO EMI for the most sensitive equipment. In keeping with AIS advances, Lunasea Lighting has developed a new masthead light that utilizes Active Current Control technology. The masthead lamp eliminates all high frequency noise without compromising optical capability or mechanical and electrical specifications. This lightweight fixture, made of machined aluminum weighs just 140 grams (4.9 ounces). We’ve added emergency flash, auto daylight turnoff for anchor, and a removable bird spike. The waterproof connector is only 0.38 inch wide for easier cable routing. The glass lens assures excellent light transmission for the life of the product. And last but not least, we hard anodized the unit to withstand harsh saltwater environments. 3 year warranty.